Date:   9/10/2008 11:18:44 AM ( 16 y ago)
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http://www.msnbc.msn.com/id/26627227



Three weeks into Maddie Ratcliff’s first year of school, the South Carolina kindergartner is already the subject of an unwelcome Science experiment: What’s the best way to get rid of head lice?

It’s a question that has stumped her mother, Brittany Ratcliff, 28, of Charleston, who was horrified to find tiny parasites in her 5-year-old’s hair this week — and even more upset to discover that over-the-counter medications wouldn’t kill them because the bugs have grown resistant to the poison.

“I’m a little traumatized,” said Ratcliff, an office administrator. “I was very grossed out by it.”


As school begins, health officials and parents across the country are bracing for this year’s bout of what some call “super lice,” drug-resistant critters that fend off nearly all pesticides, even as experts say better treatments for the ancient, annoying condition may be waiting in the wings.

Researchers have been warning for years that head lice in the U.S. and around the world are developing immunity to the strong insecticides used in over-the-counter and prescriiption shampoos. It takes just three to five years for the bugs to adapt to a new product, despite claims to the contrary by the manufacturers, noted Shirley C. Gordon, an associate professor at Florida Atlantic University who studies persistent head lice.

Health officials have continued to recommend the products, however, because over-the-counter medications like the permethrin in Nix, the pyrethrin s in RID, the lindane in Kwell and the prescriiption malathion in Ovide still work in some people, some of the time.

But the nation’s school nurses, often the first defense against the scourge, say it’s clear to them that families confronted with the critters are increasingly frustrated by the product failures.

“I had a mom drag her child into my office on the first day of school,” said Jill Burgin, a registered nurse at Stiles Point Elementary in Charleston. “She had been battling it throughout the summer and wanted advice on where to go from there.”

Burgin and other nurses are hoping that potential new solutions — from faster-acting, more effective insecticides to gels that smother the lice to hot air treatments that desiccate them — will come to the rescue.

Itchy condition most common in schoolkids
Infestations of head lice — or pediculosis — long have been common in day care centers and elementary schools, mostly because the close contact among young children is suited to spreading the tiny insects, about the size of a sesame seed, that crawl from head to head and latch onto hair follicles so they can feed on tiny droplets of blood.

NBC VIDEO


Super head lice?
June 14, 2007: British researchers find that common head lice has become more resistant to Antibiotics . ITN's Elaine Willcox reports.
MSNBC



Adult lice can live for up to a month on a person’s head, but they need to feed several times a day. Without nutrition, lice will die within one to two days of leaving the host.

Exactly how common the critters have become is a subject of much debate. The federal Centers for Disease Control and Prevention estimates that between 6 million and 12 million children aged 3 to 11 are infested each year. In a letter in this month’s edition of the Journal of Emerging Infectious Diseases, researchers in Greece summarized studies on the prevalence of head lice around the world, reporting that it ranged from 1.6 percent in schoolchildren in the United States to 30 percent of kids in Turkey and nearly 60 percent among those in Egypt.

However, those figures are questionable at best, said Richard J. Pollack, a public health entomologist at the Harvard School of Public Health who has studied lice for decades. Underdiagnosis of head lice is very common among parents and health workers who miss the signs of the tan-colored lice and their tiny, opalescent eggs, called nits. But over-diagnosis is also a problem when it contributes to hysteria that keeps perfectly healthy children out of school. Pollack said he once pursued reports of lice outbreaks the way some weather-watchers chase tornadoes, but stopped when many proved to be parental worry run amok.

"Real as well as imagined infestations are over-treated, often multiple times," Pollack said.

By his calculations, about 1 percent of kids actually are infested at any single moment in time, which would amount to about 400,000 cases in the U.S. each year.

Head lice aren’t dangerous and don’t spread disease, said Pollack, who scoffs at the notion of "super" lice and considers the bugs more a nuisance than a public health menace. But that argument is a hard sell among parents who encounter the crawly creatures on a child’s head.

“I have literally had parents scream on the other end of the phone,” said Burgin, the South Carolina school nurse. Getting rid of head lice
Human head lice, known as pediculosis capitis, are an ancient affliction that affects people around the world, particularly schoolchildren. Athough itchy and annoying, the tiny insects and their eggs are not dangerous and they don't spread disease. Still, most people infested are interested in getting rid of them as quickly as possible. Here are answers to common questions:

— How do head lice spread? They move by crawling; they don't hop or fly. They're most easily spread by direct contact with infested hair, often through sharing hats or combs, or by children playing closely together.
— Where are they found? Adult lice and their eggs, called nits, are found on the scalp, particularly around and behind the ears and the nape of the neck. Parents are encouraged to conduct regular checks of their children, searching there first for signs of irritation. Nits cement themselves firmly to the base of a hair shaft.
— What are signs of head lice infestation? Itching and tickling on the head, particularly at night. Sores on the head caused by scratching.
— How do I treat head lice? The most common treatments for head lice are over-the-counter and prescriiption shampoos and creme rinses that include pesticides. Increasingly however, lice in the U.S. and around the world have become resistant to the drugs. Follow the directions on the package for applying the medication, called a pediculicide. If no dead lice are found eight to 12 hours after treatment and existing lice remain lively, the medication may not work. A health professional may be able to provide a different medication that may kill the bugs. Comb nits from the hair with a fine-toothed comb.
— How many times do I have to treat? Retreatment is recommended after 9 to 10 days in order to kill any surviving lice before they produce new eggs, except when using malathion. Consult package directions or a doctor when using that product.
— What if it doesn't work? Consult a doctor to talk about options. Some methods that don't rely on pesticides may be available and effective.
— What else should I do? Machine wash bed linens and other items used by the infested person in very hot water, at least 130 degrees Fahrenheit. Dry in a hot dryer. Soak combs and brushes in very hot water for 5 to 10 minutes. Vacuum floors and furniture.
— What shouldn't I do? Don't feel ashamed. Head lice affect people in every economic and social category. Don't feel compelled to use extensive, expensive housecleaning methods, like steam-cleaning carpets. Don't take drastic action, like shaving a child's head.
Source: Centers for Disease Control and Prevention


Stigma about the bugs still lingers
In Eagan, Minn., some parents blamed the local high school for not monitoring certain students last year when a lice outbreak forced screening of 250 kids and sent 69 home in a single day, said Kathleen Hook, the school nurse. “We live in an affluent area and there’s still that stigma,” Hook said.

Health officials are quick to emphasize that while lice are most common in children, particularly girls, they’re also found in adults and in all kinds of households.

“It has nothing to do with the cleanliness of the home or the socioeconomic status of the parent,” noted Amy Garcia, executive director of the National Association of School Nurses.

The shame surrounding head lice has eased a bit in recent years, particularly as more schools have overturned so-called “no-nit” policies that keep kids out of class until all lice eggs have been removed. Under that scenario, too many children missed too much school, losing valuable learning time and suffering psychological damage from being shunned, said Gordon, the researcher at Florida Atlantic University.

In one study she conducted, some children missed up to 54 days of school out of a 180-day school year, nearly a third of classroom time.

Getting kids back to class and families back to normal is the goal of head lice treatment, which still depends largely on the medications whose effectiveness is waning. Sales of lice shampoos and crème rinses accounted for more than $57 million in sales last year, according to IMS, a health care information and consulting company.

Ovide, a malathion lotion, is the only treatment that consistently continues to kill lice in the U.S., even though the bugs have become largely resistant elsewhere in the world, said Terri L. Meinking, a longtime University of Miami lice expert who now runs a private research company.

Is 'Lice Asphyxiator' the answer?
Meinking said several promising products are awaiting approval by the federal Food and Drug Administration in coming months that work in 30 minutes instead of up to 12 hours, as well as a product that prevents lice from closing their spiracles, or breaathing tunnels, effectively smothering them. Sciele Pharma Inc. has such a product, dubbed the "lice asphyxiator."

Gordon said she’s also interested in pending FDA approval of a product created by University of Utah researchers. Called the Louse Buster, it uses a high-volume air dryer that uses hot air to desiccate lice.

Until more effective treatments are found, parents will continue to be forced to experiment with available medications and to resort to old-fashioned treatments such as removing nits with a fine-toothed comb.


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That’s how Brittany Ratcliff spent most of Monday, painstakingly poring over Maddie’s head. She had tried an over-the-counter package of RID after detecting the bugs on Sunday and was stunned to find live lice on Monday morning.

She hadn't considered home remedies that largely have been debunked by scientists, such as coating kids' heads in olive oil or soaking their scalps with Listerine. But, faced with stubborn bugs and an itchy child, Ratcliff is thinking again.

“I called my pediatrician and they really didn’t want me to bring her in,” Ratcliff said. “The nurse suggested that I saturate her head in mayonnaise, but I haven’t brought myself to do that.”

© 2008 MSNBC Interactive


I've also heard that the Northeast has an epidemic of bedbugs, because bedbugs have also become resistant to common insecticides.

Do you guys think that maybe a lot of parasites are now resistant to the drugs we have to treat them?

Julie
 

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